Welded plow frog



Dec. 23, 1952 R. J. ALTGELT 2,622,502

WELDED PLOW FROG Fiqd Jan. 12, 1950 ATTORNEY Patented Dec. 23, '1952 UNITED STATES PATENT oFFlcI;

WELDED PLOW FROG Rudolph J. Altgelt, South Bend, Ind., assignor to Dearborn Motors Corporation, Highland Park, Mich., a corporation of Delaware Application January 12, 1950, Serial No. 138,211

(Cl. S7- 113) 1 Claim. 1

This invention relates to an improved welded plow frog for moldboard plows.

Moldboard plows generally utilize a moldboard having a compound curved surface and the share used 4in `conjunction with a .moldboard is also arcuately formed to blend with the curvature of the moldboard. As is well known, the share and the forward edge of the moldboard receives the most wear during the operation of the plow be .cause such lportions Vof the plow penetrate 'the soil first and receive the .brunt of the erosionand wear. As the share element of the plow is relatively inexpensive such share can be cheaply replaced with a new one when worn, however, the moldboard of the plow is comparatively dificult to manufacture and is correspondingly more expensive than the share hence its replacement is an item of considerable moment. In order to reduce the wearon the moldboard it has been `customary to shorten ithe moldboard somewhat by vreducing the overall length of the moldboard and providing a replaceable shin piece ahead of the moldboard and in abutment with the moldboard proper. The shin piece being a much smaller member is more readily manufactured and hence can be cheaply replaced by a new one when worn. The moldboard `proper which receives relatively little wear can then remain von the plow for an indefinite period.

To adequately support the various elements of the kmoldboard plow, an angularly shaped frog or standard is generally provided. Such frog or vstandard is, however, .a highly complicated member to `fabricate from a single plate of steel due to the compound curve required on the moldboard face of the frog in order to receive the correspondingly curved moldboard, and the angular relationship of the landside and moldboard faces of the frog. Such a frog requires expensiven dies for its fabrication. Another disadvantage of the conventional frog is the lack of an adequate mounting for the shin piece which makes it eX- ceedingly difficult to properly secure the shin piece to the plow.

Accordingly, it is an object of this invention to provide an improved built-up frog construction of easily shaped members which may be joined by welding to provide a sturdy unitary frog.

Another object of this invention is to provide an improved frog for a moldboard plow having an improved mounting for the shin piece of the moldboard.

The specific nature of this invention, as well as other objects and advantages thereof, will become apparent to those skilled in the art from the following detailed description, taken in con.- jnnction with the attached sheet of drawings -on which, by way of preferred example only is il lustrated one embodiment of this invention.

On the drawings:

Figure 1 is a side elevational view of the landside face lof a moldboard plow incorporati-ng .the improved frog of this invention.

-Figure 2 is a :plan View of Figure l.

Figure 3 is a fragmentary cross sectional view .taken along the plane `33 of Figure 1.

VFigure 4 is an enlarged fragmentary cross sectional view taken along the plane -4-4 of Figure 2.

Figure 5 is a perspective view of the improved frog of Vthis invention.

As shown on the drawing-s:

In Figure -1 there .is show-n a plow bottom 'I0 comprising essentially a frog I I, a moldboard I2 mounted on the moldboard face of frog -II :and a landside I3 mounted Von the la-ndside face of frog II. The improved frog lIII -of this inv-ention, best shown in Figure 5, comprises a landside plate member I, and a moldboard plate member I5. The plate members I4 and |15 are blanked out in suitable dies and then pressed to the shape shown `in the appended drawings. Plate I4 is essentially a'flat plate of somewhat triangular configuration. VPlate I5, however, while of the same `general shape as plate I4, is

yprovided. with an arcuate surface |50J having a curvature corresponding to the curved 'working surface of moldboard I2. A-n integral upstanding ear member I-5b having a transverse 'hole -I-5d is provided on the upper forward corner -of plate 'I'.'i fora purpose to be 'later described. -Ear i517 is disposed above the landside face I4 of frog II and projects outwardly and laterally beyond the face of such member. The forward edge of plate member I4 is bevelled as shown at Ida and the forward edge of plate member I5 abuts the bevelled edge Ilia so that plate members I4 and I5 abut in angular relationship and such plate members are welded in this position, as indicated at IIa, to provide a unitary frog. The forward edge I5c of plate member I5 which projects beyond plate I4 is bevelled to provide a ush joint on the forward edge of frog II, as best shown in Figure 5.

Frog I I is the main support of the various elements of the plow. Moldboard I2 is mounted on the plate member I5 of frog II spaced somewhat above the bottom of such frog and rearwardly of the forward edge as shown in Figure 2, such moldboard being secured to plate member I5 by three spaced bolts I2a. A share IB is mounted on the lower edge of plate member I5 of frog II in abutting relation with moldboard I2 and is secured to such plate member by bolts ISa. A shin piece I'I comprising essentially a triangular member having an arcuate surface conforming to the arcuate surface of moldboard I2, is mounted on plate I5 of frog II ahead of moldboard I2 and in abutment therewith as shown in Figure 2. A bolt I'Ia secures the lower portion of shin II to frog II and a bolt I'Ib provided near the upper end of shin piece I'I passes through hole IEd in ear Ib thereby securing the upper end of shin piece Il' to frog II. Hole I5d is so located in ear I5b that bolt Ib will be disposed above and laterally of landside face I4 of frog II as best shown in Figure 4. From an inspection of the drawings it is readily apparent that without the provision of ear I5b it would be a difficult problem to adequately secure shin piece I'I to plate member I'5 because there would be insuiiicient bearing surface to support the shin piece and not suflicient section to permit the boring of a transverse hole for the receipt of a bolt.

The landside I3 is secured to the landside plate I4 of frog II in a horizontal position as shown in Figure 1 by bolts I3b. The forward end I3c of landside I3 is arcuately shaped to snugly abut the rear curved surface of share I6, Plow bottom I0 is mounted on the lower end portion of a plow beam I8, such plow beam projecting downwardly and in contact with the inside face of plate member I4 of frog I I as shown in Figure l. Two bolts I8a passing through transverse holes I 4c provided in plate member I4 as shown in Figure 5 and through suitable holes in beam I8, secure the beam to frog II. A third bolt ISb passes through a transverse hole (not shown) in landside I3 and through a hole Ii'ld in frog I I to secure the rear end of beam I8 to frog I I.

From the above description it will be apparent that the improved frog of this invention is readily fabricated by the use of relatively inexpensive dies and forming processes. The extremely heavy and expensive equipment formerly required to shape a frog from a single sheet of metal is eliminated by the improved construction of the frog of this invention hence resulting in a less expensive unit to fabricate. Joining the forward edges of the two plate members of the y 4 sive means for readily attaching the shin piece to the frog.

It will, of course, be understood that various details of construction may be varied through a wide range without departing from the principles of this invention and it is, therefore, not the purpose to limit the patent granted hereon otherwise than necessitated by the scope of the appended claim.

I claim:

A plow construction comprising a built-up frog including a pair of angularly disposed plate-like members, one of said members being arcuate in conguration and the other of said members being planar in configuration, said other member having an arcuate leading edge snugly abutting the rear face of vsaid one member and rigidly welded thereto along the entire arcuate line of contact therebetween to dene a sharp leading frog edge, a moldboard terminating at its front edge in spaced relation to said frog leading edge and having a rear face in flatwise contact with the exterior face of said one member, a landside in flatwise contact with said other of said members adjacent the lower edge thereof and having an arcuate forward edge lying in the plane of the rear face of said moldboard and in contact with the leading edge of said one member, a shin having a rear edge abutting the front edge of said moldboard and a leading edge overlying said landside in contact with the upper portion of the landside forward edge and projecting vertically thereabove, said first frog member having an integral upstanding projection extending laterally past the frog leading edge to directly overlie the landside, said projection and said shin having aligned bolt holes therein also overlying said landside, a bolt extending through said bolt holes to secure said shin directly adjacent the leading edge thereof to said frog projection, and other bolt means securing said moldboard and said landside to said frog.

RUDOLPH J. ALTGELT.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS Number Name Date 1,209,368 Wiard Dec. 19, 1916 2,312,371 Strandlund Mar. 2, 1943 2,424,155 Emerick July 15, 1947 

